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Finding the Third Proportional to 389.88 and 616.75

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Solution

The third proportional to 389.88 and 616.75 is: 975.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    389.88 : 616.75 = 616.75 : x
  2. Step 2: Convert to fraction form
    389.88/616.75 = 616.75/x
  3. Step 3: Cross multiply
    389.88x = 616.75 × 616.75
  4. Step 4: Simplify right side
    389.88x = 380,380.56
  5. Step 5: Solve for x
    x = 380,380.56/389.88
  6. Step 6: Final answer
    x = 975.65

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Why These Related Problems?

These problems maintain the same ratio (1.58) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.